Rename class name in placeholder

Based on BS3 2535e060a48393143e7a6c2eb93a0a5d06663801
Better hiding of empty titles in popovers

BS3 commit 2aec6dae597b69502d09aec983598e5f955ca558
Fixes broken layout for .input-group-addons within .input-large. Follows...

BS3 commit eee719f608cd0e1fe9db7cd1206b1d4dc2078bd5
Use `@font-family-base` for headings font-family variable

BS3 commit 1b89a63a48f0bfd6ba024f1cf573c03a42aa5ef2
Fixes broken layout for .input-group-addons within .input-large. Follows...

BS3 commit eee719f608cd0e1fe9db7cd1206b1d4dc2078bd5
Removes invalid focus styles on inputs

BS3 commmit 90d4343f66d1cdafe24b6de0dbb6ae64312df323
Be more specific about disabled inputs to avoid iOS bug

BS3 commit 82f9de94593ea5dd8a8efd6a317a6c8b319cfff2